// 底图
var gaode = new ol.layer.Tile({
  title: "高德地图",
  source: new ol.source.XYZ({
    url: "http://wprd0{1-4}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&style=7&x={x}&y={y}&z={z}",
    wrapX: false,
    crossOrigin: "Anonymous",
  }),
})
